The middle finger of modernity.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Museum dedicated to the terror regimes of Hungary.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

An ancient knight and a symbol of the city's freedom.

An extensive collection of ancient Egyptian artifacts and mummies.

This giant shopping mall still holds signs of its automotive past.

This one-time health resort was used by aristocrats around the world.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Once the home of a hermetic monk, this cave now houses a small church.

Budapest's Communist-era statues, banished to the suburbs.

The timepiece that exonerated a labor radical accused of a parade bombing that killed ten people.

The former Naval shipyard is open for exploring - mostly.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

A man-made island in scenic San Francisco Bay.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

A decommissioned Naval base now rents itself out for people who want to blow stuff up.

Dive bar built out of the remains of a whaling ship.

Radioactivity still cause for concern at this urban explorer's paradise.